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Fracturing method for increasing complexity of high-temperature stratum artificial crack net

A complex and artificial fracture technology, applied in the direction of earthwork drilling, production fluid, wellbore/well components, etc., can solve the problems of large ground stress difference and difficult fracture diversion in deep shale

Active Publication Date: 2018-10-16
BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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Problems solved by technology

However, due to the large ground stress difference in deep shale, it is difficult to divert fractures

Method used

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  • Fracturing method for increasing complexity of high-temperature stratum artificial crack net

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Embodiment

[0028] figure 1 Well X shown is a pre-exploration well in a certain structural zone, which is a schematic diagram of complex fractures formed by this fracturing method; the purpose of drilling is to understand the lateral changes and oil and gas laws of Carboniferous sandstone reservoirs, and to explore the Silurian Petroleum properties of sandstone and Lower Ordovician carbonate rocks. The well was drilled to a deeper design depth of 5300m and completed. The bottom of the well is the middle-lower Ordovician, and the bottom of the artificial well is 4458.0m. The target interval of fracturing in this well is 4374.5-4413.5m, with a span of 39m, the perforation sections are 4374.5-4391.5m, 4410.0-4413.5m, and the perforation thickness is 20.5m. A fracturing stimulation method for enhancing the complexity of artificial fractures in high-temperature sandstone formations, comprising the following steps:

[0029] Step 1: Use 120 cubic meters of liquid nitrogen, liquid hydrocarbons,...

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Abstract

The invention discloses a fracturing method for increasing the complexity of a high-temperature stratum artificial crack net and belongs to the technical field of petroleum and natural gas engineeringexploitation. The method comprises the following steps that low-temperature work liquid is injected into a high-temperature stratum, a strong cold-hot stress impacting effect is generated through thehigh-temperature difference between the low-temperature work liquid and the high-temperature stratum, rock around a well is induced to generate micro cracks, then fracturing liquid is injected to enable the micro cracks to continue to expand forwards, finally temporary plugging steering liquid is injected to conduct bridge plugging on the artificial cracks to force the cracks to steer to form multi-branch cracks, and the steps are executed at least once. Through the fracturing method, the multiple artificial cracks can be formed, the seepage area is enlarged, the single-well yield and economic benefits are increased, the bursting pressure can be lowered, the fracturing construction risk caused by high temporary plugging steering pressure in the high-temperature stratum is avoided, and safe construction is ensured. The fracturing method is suitable for the high-temperature strata such as hot dry rock, deep-layer shale gas and deep-layer compact oil gas, can be used for vertical well fracturing construction and can also be applied to fracturing construction of horizontal wells, oblique wells and the like.

Description

technical field [0001] The invention belongs to the technical field of petroleum and natural gas engineering exploitation, and particularly relates to a fracturing method for increasing the complexity of artificial fracture networks in high-temperature formations. Background technique [0002] With the gradual development of exploration and development technologies around the world, engineers from various countries continue to enter deep underground resources, such as hot dry rock, deep shale gas, deep tight oil and gas, etc. How to efficiently exploit the energy stored in deep layers is the current research topic One of the new hot spots. [0003] Since the matrix permeability of deep rocks is often very low, complex fracture networks must be formed through hydraulic fracturing technology for efficient development. However, due to the deep burial of deep rocks, their plastic characteristics are enhanced, the three-dimensional stress is increased, and the fracture pressure ...

Claims

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Application Information

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IPC IPC(8): E21B43/26E21B43/267
CPCE21B43/26E21B43/267
Inventor 汪道兵宇波孙东亮李秀辉韩东旭严星明刘庆吴红军
Owner BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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